Change Portgroup minimum microversion to 1.26

This is when mode and properties were introduced

Depends-On: https://review.opendev.org/c/openstack/ironic/+/964664
Change-Id: I30ad6038ab5f1a21d0605713e4cf06dcb8e10f30
Signed-off-by: Clif Houck <me@clifhouck.com>
Signed-off-by: Jay Faulkner <jay@jvf.cc>
diff --git a/ironic_tempest_plugin/tests/api/admin/test_portgroups.py b/ironic_tempest_plugin/tests/api/admin/test_portgroups.py
index 332c791..80724fe 100644
--- a/ironic_tempest_plugin/tests/api/admin/test_portgroups.py
+++ b/ironic_tempest_plugin/tests/api/admin/test_portgroups.py
@@ -21,7 +21,7 @@
 class TestPortGroups(base.BaseBaremetalTest):
     """Basic positive test cases for port groups."""
 
-    min_microversion = '1.23'
+    min_microversion = '1.26'  # portgroup mode and properties introduced
 
     def setUp(self):
         super(TestPortGroups, self).setUp()